[PATCH 17/27] HID: wacom: EKR: have proper allocator and destructor

Benjamin Tissoires
2016-07-05T14:40:20Z

The wacom_remote_create_attr_group() and wacom_remote_destroy_attr_group()
functions were both allocating/destroying the sysfs groups but also
initializing the parameters for the remotes. Have proper functions
that can be called and extended.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
drivers/hid/wacom_sys.c | 93 ++++++++++++++++++++++++++++---------------------
1 file changed, 53 insertions(+), 40 deletions(-)

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 241acee..27ca147 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -1300,8 +1300,6 @@ static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
int error = 0;
struct wacom_remote *remote = wacom->remote;

- remote->serial[index] = serial;
-
remote->remote_group[index].name = devm_kasprintf(&wacom->hdev->dev,
GFP_KERNEL,
"%d", serial);
@@ -1319,27 +1317,13 @@ static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
return 0;
}

-static void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial)
+static void wacom_remote_destroy_attr_group(struct wacom *wacom, unsigned int i)
{
struct wacom_remote *remote = wacom->remote;
- int i;

- if (!serial)
- return;
-
- for (i = 0; i < WACOM_MAX_REMOTES; i++) {
- if (remote->serial[i] == serial) {
- remote->serial[i] = 0;
- wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
- if (remote->remote_group[i].name) {
- sysfs_remove_group(remote->remote_dir,
- &remote->remote_group[i]);
- devm_kfree(&wacom->hdev->dev,
- (char *)remote->remote_group[i].name);
- remote->remote_group[i].name = NULL;
- }
- }
- }
+ sysfs_remove_group(remote->remote_dir, &remote->remote_group[i]);
+ devm_kfree(&wacom->hdev->dev, (char *)remote->remote_group[i].name);
+ remote->remote_group[i].name = NULL;
}

static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
@@ -1916,6 +1900,50 @@ fail:
return;
}

+static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
+{
+ struct wacom_remote *remote = wacom->remote;
+ u32 serial = remote->serial[index];
+ int i;
+
+ wacom_remote_destroy_attr_group(wacom, index);
+
+ for (i = 0; i < WACOM_MAX_REMOTES; i++) {
+ if (remote->serial[i] == serial) {
+ remote->serial[i] = 0;
+ wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
+ }
+ }
+}
+
+static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
+ unsigned int index)
+{
+ struct wacom_remote *remote = wacom->remote;
+ int error, k;
+
+ /* A remote can pair more than once with an EKR,
+ * check to make sure this serial isn't already paired.
+ */
+ for (k = 0; k < WACOM_MAX_REMOTES; k++) {
+ if (remote->serial[k] == serial)
+ break;
+ }
+
+ if (k < WACOM_MAX_REMOTES) {
+ remote->serial[index] = serial;
+ return 0;
+ }
+
+ error = wacom_remote_create_attr_group(wacom, serial, index);
+ if (error)
+ return error;
+
+ remote->serial[index] = serial;
+
+ return 0;
+}
+
static void wacom_remote_work(struct work_struct *work)
{
struct wacom *wacom = container_of(work, struct wacom, remote_work);
@@ -1924,7 +1952,7 @@ static void wacom_remote_work(struct work_struct *work)
unsigned long flags;
unsigned int count;
u32 serial;
- int i, k;
+ int i;

spin_lock_irqsave(&remote->remote_lock, flags);

@@ -1949,28 +1977,13 @@ static void wacom_remote_work(struct work_struct *work)
if (remote->serial[i] == serial)
continue;

- if (remote->serial[i]) {
- wacom_remote_destroy_attr_group(wacom,
- remote->serial[i]);
- }
-
- /* A remote can pair more than once with an EKR,
- * check to make sure this serial isn't already paired.
- */
- for (k = 0; k < WACOM_MAX_REMOTES; k++) {
- if (remote->serial[k] == serial)
- break;
- }
+ if (remote->serial[i])
+ wacom_remote_destroy_one(wacom, i);

- if (k < WACOM_MAX_REMOTES) {
- remote->serial[i] = serial;
- continue;
- }
- wacom_remote_create_attr_group(wacom, serial, i);
+ wacom_remote_create_one(wacom, serial, i);

} else if (remote->serial[i]) {
- wacom_remote_destroy_attr_group(wacom,
- remote->serial[i]);
+ wacom_remote_destroy_one(wacom, i);
}
}
}
--
2.5.5